| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| package org.apache.myfaces.buildtools.maven2.plugin.faces.util; |
| |
| import java.util.Iterator; |
| import java.util.NoSuchElementException; |
| |
| /** |
| * CompoundIterator consumes the initial iterator before |
| * observing the next iterator. |
| */ |
| public class CompoundIterator implements Iterator |
| { |
| public CompoundIterator( |
| Iterator primary, |
| Iterator secondary) |
| { |
| this(new Iterator[] {primary, secondary}); |
| } |
| |
| public CompoundIterator( |
| Iterator[] iterators) |
| { |
| _iterators = iterators; |
| _index = 0; |
| _advance(); |
| } |
| |
| public boolean hasNext() |
| { |
| return (_next != null); |
| } |
| |
| public Object next() |
| { |
| if (_next == null) |
| throw new NoSuchElementException(); |
| |
| Object obj = _next; |
| _advance(); |
| return obj; |
| } |
| |
| public void remove() |
| { |
| throw new UnsupportedOperationException(); |
| } |
| |
| private void _advance() |
| { |
| Iterator current = _iterators[_index]; |
| if (current != null && !current.hasNext()) |
| { |
| _index ++; |
| current = (_index < _iterators.length) ? _iterators[_index] : null; |
| } |
| |
| _next = (current != null && current.hasNext()) ? current.next() : null; |
| } |
| |
| private Object _next; |
| private Iterator[] _iterators; |
| private int _index; |
| } |